ios - 如何从 Pan 手势触发 Segue？

Question

我在 Storyboard的 UIViewController 上设置了以下平移手势代码。

在 ViewDidLoad 中:

    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
[self.view addGestureRecognizer:panRecognizer];

然后我有以下调用:

#pragma mark - GESTURE RECOGNIZERS

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
CGPoint velocity = [panRecognizer velocityInView:self.view];

NSLog(@"Pan Detected.");

if(velocity.x > 0)
{
    NSLog(@"Pan went right.");
}
else
{
    NSLog(@"Pan went left.");

    if (panRecognizer.state == UIGestureRecognizerStateChanged)
        NSLog(@"State Changed.");
}
}

当我从左向右拖动手指时，上面的代码会触发。我希望它仅在我从屏幕右边缘拖动时触发。然后我想转到另一个 StoryBoard 上的 UIViewController。 (我想从右边缘模态地将设置屏幕拖到应用程序的主屏幕上)。 UIViewController 的设置只需要部分拖到屏幕上。

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
NSLog(@"prepareForSegue: %@", segue.identifier);
if([segue.identifier isEqualToString:@"Settings"])
{
    NSLog(@"Show Settings View Controller");
    OLStoryboardLink *storyboardLink = segue.destinationViewController;
    //send the string
    storyboardLink.setStoryboardName = @"Settings";
    storyboardLink.transitioningDelegate  = self;
    [self presentViewController:storyboardLink animated:YES completion:nil];
}
}

如何从屏幕右边缘的平移手势触发 segue？

Answer 1

无法从 Storyboard A 中的 viewController 执行到 Storyboard B 中的 viewController。要使用 segue，2 个 viewController 必须在同一个 Storyboard 中。

但要回答这个问题，您可以通过调用 performSegueWithIdentifier: 方法触发 segue:

- (void)panDetected:(UIPanGestureRecognizer *)panRecognizer
{
    CGPoint velocity = [panRecognizer velocityInView:self.view];

    NSLog(@"Pan Detected.");

    if (velocity.x > 0)
    {
        NSLog(@"Pan went right.");
    }
    else
    {
        NSLog(@"Pan went left.");     

        if (panRecognizer.state == UIGestureRecognizerStateChanged)
            NSLog(@"State Changed.");

        [self performSegueWithIdentifier:@"Settings" sender:panRecognizer];
    }
}

有关详细信息，请参阅 Apple's reference